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1
Content available Multipurpose RF field vector controller for linear accelerators
Jałmużna W., Cichalewski W., Szewiński J.
International Journal of Microelectronics and Computer Science
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2010
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Vol. 1, nr 1
89-94
EN
The paper describes the design and the implementation of the flexible, multipurpose RF (Radio Frequency) field Vector Controller for the linear accelerators based on the superconducting technology. The implementation is done for the FPGA (Field Programmable Gate Array) based LLRF (Low Level Radio Frequency) control systems. The full process of the requirement analysis and the library implementation is presented. It is followed by the description of the controller's applications and the results of the performance tests. The controller fulfills the requirements of the various accelerator facilities and hardware platforms and can be easily adapted for the planned experiments to decrease their cost by avoiding expensive research and development phase.
2
Content available High power amplifiers chain nonlinearity influence on the acelerating beam stability in free electron laser (FLASH)
Cichalewski W., Jałmużna W.
International Journal of Microelectronics and Computer Science
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2010
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Vol. 1, nr 1
77-80
EN
The high power amplifiers transfer characteristics nonlinearities can have a negative influence on the overall system performance. This is also true for the TESLA superconducting cavities accelerating field parameters control systems. This Low Level Radio Frequency control systems uses microwave high power amplifiers (like 10 MW klystrons) as actuators in the mentioned feedback loops. The amplitude compression and phase deviations phenomena introduced to the control signals can reduce the feedback performance and cause electron beam energy instabilities. The transfer characteristics deviations in the Free Electron Laser in Hamburg experiment have been investigated. The outcome of this study together with the description of the developed linearization method based on the digital predistortion approach have been described in this paper. Additionally, the results from the linearization tool performance tests in the FLASH's RF systems have been placed.
3
Content available Improving Dependability of Automation for Free Electron Laser FLASH
Kosęda B., Szmuc T., Cichalewski W.
Journal of Automation Mobile Robotics and Intelligent Systems
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2009
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Vol. 3, No. 1
33-39
EN
Free-electron laser FLASH (260-meter-long machine) is a pilot facility for the forthcoming XFEL (3 km). Along with growth of the experiment, service and maintenance are becoming so complex that certain degree of automation seems to be inevitable. The main purpose of the automation software is to facilitate operators with computer-aided supervision of several hardware/software subsystems. The efforts presented in this contribution concern elaboration of general framework for designing and development of automation software for the FLASH. The toolkit facilitates specification, implementation, testing and formal verification. The ultimate goal of the framework is to systematize the way of automation software development and to improve its dependability. At present usefulness of the tools is being evaluated by testing the automation software for single RF-power station of the FLASH.
4
Przegląd prac Politechniki Łódzkiej realizowanych w programie CARE
Napieralski A., Grecki M., Sękalski P., Makowski D., Wójtowski M., Cichalewski W., Kosęda B., Świercz B.
Elektronika : konstrukcje, technologie, zastosowania
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2005
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Vol. 46, nr 2-3
78-79
5
Komputerowy system automatyzacji sterowania podsystemami akceleratora VUV-FEL
Cichalewski W., Kosęda B.
Elektronika : konstrukcje, technologie, zastosowania
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2005
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Vol. 46, nr 7
15-21
PL
Laser VUV-FEL (Vacuum Ultra Violet Free Electron Laser) uruchamiany obecnie w ośrodku DESY jest niezwykle kosztownym i skomplikowanym przedsięwzięciem. Ze względu na stopień jego złożoności, zdecydowano się zaprojektować system informatyczny wspomagający zarządzanie jego infrastrukturą. Opracowanie przedstawia próby rozwiązania dla modułów przyspieszających oraz ich stacji zasilających. Do głównych zadań systemu należeć będzie zabezpieczenie urządzeń przed próbami niepoprawnego użycia, zarządzanie zestawem algorytmów automatyki, wspomaganie operatorów podczas wykonywania skomplikowanych operacji oraz automatyczne przywracanie sprawności systemu w przypadku krótkotrwałych usterek. Rozwiązanie będzie uwzględniać trzy tryby pracy: ręczny, półautomatyczny i automatyczny.
EN
Because of the complexity of the VUV-FEL laser project, there was decided that a sophisticated system would be created for the different component work management. In this publicationparts of the system responsible for accelerating modules and RF power stations automation were described. Described control system goals are: to prevent from improper using of the device, to manage workof the control algorithms, to aid an operator in the laser operation and to provide exception handling for a different system break downs. In this system three different way of work are forseen: manual, semi automatic, automatic.
6
I and Q table optimization for local oscillator system calibartion and signal generation
Cichalewski W., Kosęda B., Brandt A.
Mikroelektronika i Informatyka : prace naukowe
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2004
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Z. nr 4
29-33
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